6447823 has 4 divisors (see below), whose sum is σ = 6465760. Its totient is φ = 6429888.

The previous prime is 6447817. The next prime is 6447829. The reversal of 6447823 is 3287446.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6447817) and next prime (6447829).

It is a 6-Lehmer number, since φ(6447823) divides (6447823-1)⁶.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6447823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8418 + ... + 9151.

It is an arithmetic number, because the mean of its divisors is an integer number (1616440).

Almost surely, 2^6447823 is an apocalyptic number.

6447823 is a deficient number, since it is larger than the sum of its proper divisors (17937).

6447823 is a wasteful number, since it uses less digits than its factorization.

6447823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17936.

The product of its digits is 32256, while the sum is 34.

The square root of 6447823 is about 2539.2563872126. The cubic root of 6447823 is about 186.1248535449.

The spelling of 6447823 in words is "six million, four hundred forty-seven thousand, eight hundred twenty-three".